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x86/bugs: Move the l1tf function and define pr_fmt properly 

commit 56563f53d3 upstream

The pr_warn in l1tf_select_mitigation would have used the prior pr_fmt
which was defined as "Spectre V2 : ".

Move the function to be past SSBD and also define the pr_fmt.

Fixes: 17dbca1193 ("x86/speculation/l1tf: Add sysfs reporting for l1tf")
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Konrad Rzeszutek Wilk 2018-06-20 16:42:57 -04:00 committed by Greg Kroah-Hartman
parent 4bb1a8d8f8
commit 202f905608
1 changed files with 29 additions and 26 deletions
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55
arch/x86/kernel/cpu/bugs.c
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@ -209,32 +209,6 @@ static void x86_amd_ssb_disable(void)
wrmsrl(MSR_AMD64_LS_CFG, msrval);
}
static void __init l1tf_select_mitigation(void)
{
u64 half_pa;
if (!boot_cpu_has_bug(X86_BUG_L1TF))
return;
#if CONFIG_PGTABLE_LEVELS == 2
pr_warn("Kernel not compiled for PAE. No mitigation for L1TF\n");
return;
#endif
/*
* This is extremely unlikely to happen because almost all
* systems have far more MAX_PA/2 than RAM can be fit into
* DIMM slots.
*/
half_pa = (u64)l1tf_pfn_limit() << PAGE_SHIFT;
if (e820__mapped_any(half_pa, ULLONG_MAX - half_pa, E820_TYPE_RAM)) {
pr_warn("System has more than MAX_PA/2 memory. L1TF mitigation not effective.\n");
return;
}
setup_force_cpu_cap(X86_FEATURE_L1TF_PTEINV);
}
#ifdef RETPOLINE
static bool spectre_v2_bad_module;
@ -660,6 +634,35 @@ void x86_spec_ctrl_setup_ap(void)
x86_amd_ssb_disable();
}
#undef pr_fmt
#define pr_fmt(fmt) "L1TF: " fmt
static void __init l1tf_select_mitigation(void)
{
u64 half_pa;
if (!boot_cpu_has_bug(X86_BUG_L1TF))
return;
#if CONFIG_PGTABLE_LEVELS == 2
pr_warn("Kernel not compiled for PAE. No mitigation for L1TF\n");
return;
#endif
/*
* This is extremely unlikely to happen because almost all
* systems have far more MAX_PA/2 than RAM can be fit into
* DIMM slots.
*/
half_pa = (u64)l1tf_pfn_limit() << PAGE_SHIFT;
if (e820__mapped_any(half_pa, ULLONG_MAX - half_pa, E820_TYPE_RAM)) {
pr_warn("System has more than MAX_PA/2 memory. L1TF mitigation not effective.\n");
return;
}
setup_force_cpu_cap(X86_FEATURE_L1TF_PTEINV);
}
#undef pr_fmt
#ifdef CONFIG_SYSFS
static ssize_t cpu_show_common(struct device *dev, struct device_attribute *attr,